Wasp excluder for air brakes



Dec.7,1937, T EVERETT 2,101,214

" WASP EXCLUDER FIOR AIvR BRAKES Filed Feb. l5, 1937 Patented Dec. 7, 1,937V

UNITEB STATES PATENT OFFICE Terry Everett, Watertown, N. Y., assignor to The New York Air Brake Company, a corporation of New Jersey Application February 15, 1937, Serial No. 125,864

1 Claim.

This invention relates to wasp excluders and particularly to excluders ofthe general type described and claimed in the patent to Campbell, No. 2,046,058, June 30, 1936.

According to that patent six radial non-intersecting slots are used. There is an important advantage in avoiding intersection of the slots because the structure is stronger, and the large aperture caused by intersection is avoided. However, three diametric intersecting Vslots can be sawn more quickly and economically. Consequently in commercial practice certain features of the patent to Taylor No. 2,040,451, have been used, i. e., three intersecting diametric cross slots have been sawn and a cylindrical pin has been pressed into the intersection to blind the same and stiien the structure.

Slight variations in width or location of the slots greatly affect the size of the opening at the intersection, so that a close fit of the pins is difcult to secure economically. The present invention avoids the need for the pin and produces an excluder which has the practical advantages of the Campbell device, and yet may be economi- 25 cally manufactured.

Generally stated, an annular channel is cut from the base (threaded end) far enough to reach the pathof the cross-slotting saw. The tool which cuts the channel leaves a central hub beyond the path of the saw. Then the other end is cross slotted, the slots communicating with therannular channel. The hub blinds the relatively large Y opening at the intersection of the slots and stiiens the sector shaped portions between slots. 35 The invention in its preferred embodiment will now be described by reference to the accom- 1 panying drawing, in which,- Y

Fig. l is a fragmentary elevation of va retainer valve, partly broken away to show'the improved wasp excluder in position in the exhaust port. The parts are shown in this ligure (as presented inthe original drawing) twice actual size (magnified 2 diameters).

Fig. 2 is an elevation of the excluder on a still 45 more enlarged scale.

Fig. 3 is an end elevation thereof. Y Fig. 4 is a perspective view of the device in axial section the section being taken through one slot. Fig. 5 is a perspective view with a portion of 50 the threaded base broken away.

In Fig. 1, the retainer valve is generally indicated at 6 and has an exhaust port 'I pipethreaded at its end. Into this threaded end is.

screwed the pipe-threaded base 8 of the excluder, the parts being so dimensioned that when the retainer is screwed home the smooth, flattened extension 0 is whollyyvithin the threaded end of the port. It is shown slightly countersunk, may be flush, but should not project as it might then be sealed by ice or sleet.

Formed in the threaded end of the base is a bore II leading to an annular channel I2 which extends slightly beyond the end of the threads on base-8 and leaves a central hub or boss I3. Three diametric slots I4 are sawn through the extension 0. These run substantially to the threads on the base, the important thing being that they cut across the full width of the channel I2 on both sides of' hub I3 but do not completely sever such hub.

In practice it is satisfactory if the slots I4 are g1g wide and the channel I2 is 5/64 wide. The unslotted portion of the hub may be gli" thick or more, depending on the stiffening effect desired.

-In any case the hub serves to blind the rather large opening produced by intersection of the cross slots.

Consider Fig. 3. There are two cross slots I4 intersecting at 90 and a third having a common intersection'to the rst two and bisecting the angle between. This arrangement gives four small and two large intervening sectors, the latter Y Ybeing large and hence strong enough to receive the screw-driver slot I5 by means of which the excluder is screwed to position. Since the wasp cannot get into the slot I4 or past hub I3, it is immaterial whether she can enter or otherwise fill the opening olered by the intersection of the slots. Should she do so the restriction would not exceed that oiered by the pin in the present commercial excluder.

A wasp excluder of the type comprising in one piece an attaching base and an extension having intersecting cross slots, in which the cross slots communicate with an annular bore leading from the end of said base, said bore surrounding a central hub integral with said base and extension, said hub serving to blank the intersection of the cross slots and to stiien the slotted extension.

TERRY EVERE'FI. 

